Replacement battery not charged?

Hello!

Im doing a battery replacement for my iPhone and the replacement seems to be depleted? I made sure this was true by testing my old battery and new battery (to make sure I didn't mess anything up) then putting the new battery on a charger. It first gave the normal empty battery charging symbol iphones usually do and came back up after some time on the charger. Is this healthy for the replacement battery to be fully depleted upon receiving it? Should I send it back to IFixIt?

Thanks!